Coffee maker



FIG. 1 is a left front perspective view of a coffee maker showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a coffee maker, as shown. 